(共36张PPT)
人教版2022-2023年度九年级英语全册同步课件
Unit 13 We’re trying to save the earth!
Section A(3a-4c)
Learning objectives
1. Words and useful expressions: shark, fin, cruel, harmful, chain, ecosystem, industry, law, scientific, afford, reusable, transportation , be harmful to, at the top of, the food chain, take part in, turn off, pay for, take action
2.Talk about pollution and environmental protection.
3.能够正确区分和使用以下语法结构：现在进行时、 used to、被动语态、现在完成时、情态动词等。
Lead in
Free talk
Do you know any endangered animals
snow leopard
Siberian Tiger
Free talk
Do you know any endangered animals
red panda
polar bear
Free talk
Do you know any endangered animals
Galapagos penguin
green turtle
What do you know about sharks
Do you think sharks are endangered Why
What do you think might have caused a fall in the number of sharks
shark n. 鲨鱼
fin n. （鱼）鳍
cruel adj. 残酷的；残忍的
harmful adj. 有害的
be harmful to对……有害
at the top of 在……顶部或顶端
chain n. 链子；链条
the food chain食物链
ecosystem n. 生态系统
industry n. 工业；行业
law n. 法律；法规
scientific adj. 科学上的；科学的
Read the passage in 3a quickly and answer the questions.
Sharks are at the top of the food chain in the ocean’s ecosystem.
Yes, I think sharks are endangered. Because people catch sharks, they cut off their fins and throw the shark back into the ocean. Without a fin, a shark can no longer swim and slowly dies.
People catch sharks and cut off their fins and throw them back into the ocean. Without a fin, a shark dies.
What do you think might have caused a fall in the number of sharks
Do you think sharks are endangered Why
What do you know about sharks
Where shark fin soup is popular
Number of sharks caught and traded every year
How governments can help
Two environmental groups against “finning”
Read the passage about sharks and complete the fact sheet below.
3a
in southern China
around 70 million
to develop laws to stop the sale of shark fins.
WildAid and the WWF
1. Many people do not realize they are killing a whole shark ______
they enjoy a bowl of shark fin soup.
2. Sharks are at the top of the food chain, ________ if their numbers
drop, the ocean’s ecosystem will be in danger.
3. Many think that sharks are too strong to be endangered, _______
they are wrong.
Read the passage again and fill in the blanks with the words in the box.
when
so
but
3b
so although if but when
4. ________ there are no scientific studies to support this, a lot of
people believe that shark fins are good for health.
5. Sharks may disappear one day _______ we do not do something
to stop the sale of shark fins.
Although
if
so although if but when
3b Read the passage again and fill in the blanks with the words in the box.
Listen and read.
Save the Sharks!
Many have heard of shark fin soup. This famous and expensive dish is especially popular in southern China. But do you realize that you’re killing a whole shark each time you enjoy a bowl of shark fin soup
Fill in the blanks according to the passage.
Some people like to eat shark fin soup, especially in China. But getting the shark fin is very . When people catch sharks, they
their fins and throw the sharks back into the ocean. The sharks slowly die because they can’t without fins. And it is also to the environment. Sharks are at the of the food chain. If the number of sharks drops too low, it will break the balance of the nature. Please say no to eating shark fin soup, and take action to save the sharks!
southern
cruel
cut
off
swim
harmful
top
Save the Sharks!
提出问题：吃鱼翅就是杀害一整头鲨鱼(Para.1)
shark fin soup is popular in southern China
a bowl of shark fin soup=killing a whole shark
解决问题：国际环保组织号召反对
“猎翅”(Para.3)
cut off their fins and throw the sharks back into the ocean
cruel and harmful to the environment
around 70 million sharks are caught and traded every year
bring danger to all ocean life
the numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years
分析问题：为什么要阻止“猎翅” (Para.2)
environmental protection groups
no scientific studies have shown that shark fins are good for health
teaching the public about “finning”
asked governments to develop laws to stop the sale of shark fins
We’re trying to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
Read the following sentences and grammar items.
现在进行时
现在进行时
基本
结构
基本
用法
标志词
be (am, is, are) + v.-ing
说话瞬间正在进行或发生的动作
现阶段或当前一段时间之内正在进行的动作
now, look, listen, right now等
Grammar Focus
动词-ing形式的构成
一般情况下，在动词词尾后加-ing。go → going。
以不发音的e结尾的动词，去掉e加 -ing。 have → having。
以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这个辅音字母，再加 -ing。 stop → stopping。
Grammar Focus
现在完成时
现在完成时
基本
结构
基本
用法
标志词
have/has + 过去分词
1. 过去发生或已经完成的动作对现在造成影响或结果
2. 从过去某一时间开始一直延续到现在并还可能继续延续下去的动作
already, yet, ever, never, just, before, once, twice, recently, so far, for +时间段，since +时间点/从句。
Grammar Focus
过去分词构成规则
一般情况下，在动词后加-ed。work → worked。
在以e结尾的动词后只加 -d。close → closed。
在以辅音字母加y结尾的动词，应将y改为i再加ed。study → studied。
以重读闭音节结尾的动词，要双写末尾的辅音字母再加-ed。stop → stopped。
不规则动词的过去分词: AAA型 put put put
AAB型 beat beat beaten
ABA型 become became become
ABB型 get got got/gotten
ABC型 begin began begun
Grammar Focus
主动语态和被动语态的区别
主动语态表示主语是动作的执行者。被动语态表示主语是动作的承受者，即行为动作的对象。
I cleaned my room. → My room was cleaned by me.
I saw him cross the road and enter the shop.
→ He was seen to cross the road and enter the shop.
被动语态
在含有使役动词 (make, let等) 或感官动词 (see, watch, notice, hear等) 的主动语态的句子中，这些词后常跟省略to的动词不定式，但是改为被动语态时则要把省去的to还原。
被动语态的构成
被动语态的构成：be + 过去分词
一般现在时被动语态：am/is/are + 过去分词
一般过去时被动语态：was/ were + 过去分词
一般将来时被动语态：will be/ is going to be + 过去分词
情态动词的被动语态：can/could/may/might/should/must + be + 过去分词
Grammar Focus
used to
used to意为“过去常常做某事” ，后接动词原形。
used to句型的否定句形式：didn’t use to
used to句型的一般疑问句的形式：Did + 主语 + use to ...
used to do表示过去常常做某事，而现在往往不做了；
be used to doing表示习惯于做某事。
Grammar Focus
4a Fill in the blanks with the correct forms of the verbs in brackets.
Joe: ______ you ever ________ (take) part in an environmental project
Ken: Yes, I have. I _______ (help) with a Clean-Up Day last year. It was __________ (consider) the biggest clean-up project this city______ ever ________ (have).
Joe: How many people ________ (take) part
Have
taken
helped
considered
had
had
took
Ken: I ___________ (think) more than 1,000 people ______(come)
to help out.
Joe: That’s fantastic! I guess everyone in this city is ______ (try) to
improve the environment.
Ken: Yes, we can’t afford to________ (wait) any longer to take
action!
think
came
trying
wait
4a Fill in the blanks with the correct forms of the verbs in brackets.
People _________ think that big things__________________ be done to save the earth. Many forget that saving the earth begins with small things. For example, you ______________ save electricity by turning off the lights when you leave a room. You _______________ also use reusable bags instead of plastic bags.
4b Fill in the blanks with the appropriate modal verbs from the box.
can
would
could
have to
should
must
may/
might
may/might
should/have to/must
can/could/should
can/could/should
can
would
could
have to
should
must
may/
might
I think it’s a great idea that you now _______ pay for plastic bags in some stores. And instead of driving to school or work, you _______________ ride your bike or walk. If it’s far, you __________ take the bus. All these small things __________ add up and become big things that ______________ improve the environment. Let’s take action now!
have to
can/could/should
can/could
can/could
would/can/could
4b Fill in the blanks with the appropriate modal verbs from the box.
4c Make a list of things that people can do to help the
environment and discuss your list with your partner.
I think that everyone should use public transportation.
I disagree. It’s difficult for parents with young children to use public transportation ...
Language points
harmful
harmful为形容词。意为“有害的”。常用作be harmful to，意为“对……是有害的”，与be bad for为同义词。
Smoking is bad for your health.
【拓展】
①harm n.危害。常用作do harm to，意为“对……有害”。
②harm v.有危害。常用作harm sb./sth.，意为“对……有害”。
Reading in the sun does harm to your eyes.
=Reading in the sun harms your eyes.
afford
afford为动词，意为“承担得起；负担；提供”。用法如下：
(1)与 can, be able to等连用，表示“担负得起”某事或某物的费用、损失、后果等，或表示“抽得出”时间等，后面通常可接名词、代词、不定式等（多用于否定句或疑问句）。
I can’t afford (to buy)a new coat.
He can’t afford the time for it.
He says he really can’t afford to wait another day.
（2）表示“提供”“给予”，其后可以接双宾语（直接宾语通常为抽象概念），若双宾语交换位置，要用介词 to（此时无需连用 can, be able to等）。
afford v.承担得起（后果）；买得起
We can’t afford to wait any longer to take action!
I don’t have enough money, so I can’t afford the new house.
afford sth.表示“买得起/承受得起某物”，afford to do sth.表示“有能力做某事/负担得起做某事”。
This method is not only cruel, but also harmful to the environment.
这种方法不仅残酷，而且对环境有害。
not only…but also…意为“不仅……而且……”,用于连接两个表示并列关系的成分，着重强调后者，其中的also有时可以省略。
She not only plays well, but also writes music.
Not only men but also women were chosen.
He works not only on weekdays but on Sundays as well.
【注意】
①若连接两个成分作主语，其谓语通常与靠近的主语保持一致。
Not only you but also he has to leave.
②若连接两个句子，not only后面的句子要用倒装。
Not only did he speak more correctly, but he spoke more easily.
Summary
Words
Useful expressions
Reading
shark, fin, cruel, harmful, chain, ecosystem, industry, law, scientific, afford, reusable, transportation
a passage about sharks
be harmful to, at the top of, the food chain, take part in, turn off, pay for, take action
Functions
Talk about pollution and environmental protection.
Grammar
能够正确区分和使用以下语法结构：现在进行时、
used to、被动语态、现在完成时、情态动词等。
Exercise
— Why not ask Bob to join us in the trip to the zoo tomorrow
— Everyone in our group loves animals, but he always seems______.
anxious B. personal C. cruel D. careless
A number of visitors _______ visiting the West Lake and the number of the visitors _____ increasing.
are; is B. is; are C. are; are
Don’t play games on the computer all day. It’s _______ to your eyes.
A. harmful B. thankful C. useful D. helpful
C
A
1
2
A
3
阅读短文，用适当的词或括号里所给词的适当形式填空。
In order to protect our environment, we should _________ (turn) off the lights when we leave a room. We should reuse books at school, stop riding in cars, turn off the shower while we ____________ (wash)our hair and so on. We had better not use paper napkins. When we go shopping, we _____________ (not, use) plastic bags, and we can take our own cloth bags.
Did you use to ________(throw)away old or waste things __________ you ever __________ (think) about how they can be reused well Some people who have creative mind use glass bottles and rocks _________ (make) useful things for everyday life. Some artists use iron and other metals or materials from old cars to make beautiful art pieces.
turn
are washing
shouldn’t use
throw
Have
to make
thought
Homework
1.Write a short passage about protecting the earth according to your discussion in 4c.
e.g. I think that everyone should use public transportation. It’s not only convenient but also …
谢谢
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